这些推荐实践为流体动力应用的碳、合金和高强度低合金钢管组件的一般规格和性能要求提供了建议，利用了常用的制造方法以及管选择和应用的一般指南。

These recommended practices provide recommendations for general specifications and performance requirements of carbon, alloy and high strength low alloy steel tube assemblies for fluid power applications utilizing commonly available manufacturing methods and general guidelines for tube selection and application.